sql 获取前几条数据

用 TOP, LIMIT, ROWNUM 来约束

例如：前三条

where rownum<=3

SQL Server / MS Access 语法

SELECT TOP 3|percent column_name(s)
FROM table_name;

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MySQL 语法

SELECT *
FROM Persons
LIMIT 3;

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Oracle 语法

SELECT *
FROM Persons
WHERE ROWNUM <=3;